基于窄频分布反馈激光器和光纤光栅的加速度传感器

Demodulation Fiber Bragg Grating Acceleration Sensor by DFB Laser

提出了一种用窄频分布反馈半导体激光器作为光源,光纤光栅作为传感元件的振动传感系统.给出了这个系统的工作原理和系统组成,设计了光纤光栅传感器的悬臂梁增敏封装形式.通过实验测量得到了频率响应曲线和加速度响应曲线,结果表明悬臂梁一端悬挂的质量块的质量越大,灵敏度越高,但共振频率也相应降低.同时讨论了不同黏度的硅油对共振的抑制效果以及系统灵敏度与分布反馈激光器输出波长的关系.

A FBG accelerometer as a sensor of oscillation system demodulated by DFB laser is demonstrated.The working principle and system constitution are presented.The cantilever packaging scheme is also designed to enhance the sensitivity of the FBG sensor. The sensor＇s response to frequency and acceleration is measured by experiment.It is shown that the heavier the mass which attached to the cantilever is, the higher sensitivity of the sensor will be,but this will result in the lower resonate frequency.Relationship between resonance suppression and viscosity of silicone oil given and discussion about the sensor＇s sensitivity and wavelength of DFB laser is carried out.